topham



Aug. 8, E TOPHAM SHOE SEWING MACHINE 6 Sheets-Sheet 1 Original FiledMarch 27, 1928 1.. E. TOPHAM 1,921,897

SHOE SEWING MACHINE Original Filed March 27, .1928

6 Sheets-Sheet 2 Aug. 8, 1933.

L. E. TOPHAM SHOE SEWING MACHINE Original Filed March 27, 1928 6Sheets-Sheet 3 L. E. TOPHAM SHOE SEWING MACHINE Original Filed March 27.1928 6 Sheets-Sheet 4 g- 3, 1933 L. E. TOPHAM 1,921,897

SHOE SEWING MACHINE Original Filed March 27, 1928 6 Sheets-Sheet 5 Aug.8, 1933. L TOPHAM 1,921,897

' SHOE SEWING MACHINE Original Filed March 27, 1928 6 Sheets-Sheet 6 \JWifrzeae MC Yatented Aug. 8, 1933 UNiTE STATES PATENT to United ShoeMachinery Corporation, Paterson, N. 5., a Corporation of New JerseyOriginal application March 27, 1928, Serial No. 265,169. Divided andthis application July 2, 1929. Serial No. 375,444

19 Claims.

The present invention relates primarily to shoe sewing machines and isherein disclosed as embodied in a machine adapted to sew the outseamconnecting the outsole with the welt, lasted upper and insole of aGoodyear welt shoe.

The present application is a division of the inventors pendingapplication Serial No. 265,- 169, filed March 27, 1928, which disclosesa machine of the same general type as that disclosed in the patent toFrench and Meyer, No. 173,- SZO, dated April 26, 1892. Thestitch-forming and work-feeding devices include a needle, an awl, a worksupport and a presser foot and are arranged to reciprocate back andforth in the line of feed to impart a continuous feeding movement to thework, as more fully described in the inventors pending application abovereferred to.

In order to increase the speed, ease and smoothness of operation ofmachines of the type disclosed in the patent to French and Meyer, abovereferred to, it has been proposed to time the operation of the variousparts of the machine so that the awl iscaused to enter the work afterthe needle has withdrawn with the loop of thread and to withdraw fromthe work before the takeup sets the stitch. A machine having its variousparts constructed and arranged to operate in this manner is disclosed inthe patent to Topham, No. 1,462,587, dated July 2 1, 1923. The machinehereinafter described as embodying the several features of the presentinvention is also constructed and arranged to operate in this manner,the awl being timed to enter the work after the needle withdraws withits loop of thread, and before the needle loop has been drawn down fromthe shuttle. 111 machines having the needle and awl timed in thismanner. if the machine is stopped at the completion of the sewingoperation with both the needle and the awl out of the work and with theneedle free of thread to permit the removal of the work, the machinemust be manipulated by the operator before a new piece of work isinserted in the machine so as to bring the awl into position toimmediately enter the work when the machine is started, as otherwiseupon starting the machine the needle will at once enter the work and beliable to become bent or broken by reason of.

thefact that no awl hole has been made in the work to receive it. Anobject of the present invention is to relieve the operator of the necessity of manipulating the machine in this manner and accordingly animportant feature of the present invention contemplates the pro visionin an outseam lockstitch sewing machine in which the awl is arranged toenter the work after the needle withdraws with its loop of thread andbefore the needle loop is withdrawn from the shuttle, of mechanismcooperating with the moving parts of the machine to bring the machine torest after the needle loop has been drawn down from the shuttle, withthe needle free of the thread, and at a point in the cycle so that whenthe machine is again started, the awl will immediately enter the work.This feature of the invention contem' plates securing this result in anydesired man ner. In the embodiment of the invention here inafterdescribed, a stop mechanism is provided which acts when thrown intooperation .to reverse the direction of rotation of the cam shaft of themachine after the needle loop has been drawn from the shuttle and tofinally stop the cam shaft with the awl at a point in the cycle ofoperations of the machine at which the awl, in a forward cycle, is aboutto enter the work. Other features of the invention which areparticularly applicable to an outseam shoe sewing machine relate to animproved mechanism for actuating the needle guide and to improvedconstructions and arrangements of parts for lifting the presser foot,opening the thread clamp and releasing the needle thread tension. Theseveral features of the present invention and the advantages securedthereby will be readily understood by those skilled in the art from thepreceding discussion and from an inspection of the accompanying drawingsand the following specific description thereof.

Referring to the drawings, Fig. 1 isa sectional end elevation of themachine embodying the several features of the present invention; Fig. 2is a detail View of a portion of the mechanism for releasing thetension; Fig. 3 is a de tail sectional planview taken on the line 3-3 ofFig. 1, illustrating a portion of the mechanism for opening the threadclamp; Fig. 4 is a sectional end elevation of the machine; Fig. 5 is adetail sectional view of a portionof the presser foot unlocking andlifting mechanism; Fig. 6 is a sectionalplan view taken on the line 6-6of Fig. 5; Fig. 7 is a detail sectional View similar to Fig. 5 butshowing the parts in a diiferent position; Fig. 8 is a sectional planview taken partly on the line 8-8 and partly on the line 8-9 of Fig. 7;Fig. 9 is a detail sectional View illustrating particularly the presserfoot and its, associated parts; Fig. '10 is an end view of the machinepartly in section and with many parts omitted; Fig. 11 is a view in rearelevation of the machine illustratin particularly the driving andstopping mechanism; Fig. 12 is a vertical sectional view of the machinelooking towards the right in Fig. 11 and taken on a plane at the left ofthe driving and stopping mechanism; Fig. 13 is a detail sectional viewtaken on a plane slightly to the l ft of the plane of Fig. 12 in Fig.11, illustrating particularly the positive stopping dog of the stopmechanism; Fig. 14 is a detail view of certain of the parts illustratedin Fig. 12 but looking in the opposite direction; Fig. 15 is a verticallongitudinal sectional view of the driving and stopping mechanism; Fig.16 is a cross-sectional view taken on the line 16-46 of Fig. 15; Fig. 17is a detail cross-sectional view taken on the line IVY-17 of Fig. 15;and Figs. 18 and 19 are detail views illustrating the mechanism foractuating the needle guide.

The curved hook needle of the machine is indicated at 38, the needleguide at 40, the awl at 42, the thread arm at 44, the loop spreador at46, the looper at 48, the shuttle at 49, the takeup at 50, the auxiliarytakeup at 52, the thread clamp at 54, the tension wheel at 56, the worksupport at 58 and the presser foot at 60, all of these parts except ashereinafter specifically described having substantially the sameconstruction and arrangement, and being operated through the samemechanisms as in the machine disclosed in the patent to French andMeyer, No. 473,870 hereinbefore referred to. needle is mounted in a sement 52 as best shown in the detail views, l8 and 19, and the awl issimilarly mounted. These parts, together with the actuating mechanisms,are fully described and illustrated in the inventors pending applicationabove referred to.

The needle segment is mounted directly on a pivot stud 64 and the needleguide is mounted on the hub of the needle segment. For actuating theneedle guide a novel and improved mechanism is provided whereby theneedle guide can be driven frictionaily to cause it to move towards andfrom the work and also can be given a forward movement with relation tothe needle to cover the empty heck of the needle after the loop ofneedle thread has been taken from the hook, and ther by prevent theneedle thread from catching on the barb of the hook during the continuedmanipulation of the thread in forming the stitch. The needle guideactuating mechanism also includes a new and improved means for d vingthe needle guide frictionally from the needle segment. The needle guideactuating mechanism is best shown in Figs. 18 and 19. As shown in thesefigures, the needle guide is provided with an arm extending radially inthe opposite direction from the portion engaging the needle in the outerend of which is mounted a friction shoe 65. This shoe is forcedoutwardly by a spring 66 set in a recess inv the arm against a frictionsurface 68 formed on the needle segment concentric with the axis of thesegment. A simple, reliable and efiicient connection is thus providedbetween the needle segment and the needle guide which will act to movethe needle guide fricticnally back and forth and against the uppersurface of the presser foot regardless of the varying thickness of thework.

After the needle loop has been taken from the needle, it is desirable toadvance the needle guide to close the needle hook and thereby pre- Thevent the thread from catching on the barb of the needle during thecontinued manipulation of the thread in forming the stitch. Accordingly,means are provided for imparting such a movement to the needle guide. Asa convenient means for producing this movement, the thread arm isutilized in the illustrated construction, a projection '70 beingprovided on the needle guide arranged to extend into a notch 72 formedon the thread arm slide when the needle guide is in its retractedposition, and a movement being imparted to the thread arm at the properpoint in the cycle of operations to cause the lower end of the notch toengage the projection and move the needle guide with relation to theneedle.

The presser foot 60, as shown in Fig. 4, is socured to the front portion74 of the presser foot lev r which is pivotally mounted upon a hollowbushing '16 secured in a projection 73 forming a portion of the machineframe. As more fully described in the inventors pending applicationabove referred to, the presser foot is arranged to reciprocate back andforth in the line of feed with the work support and to allow it to somove, the presser foot lever is made in two parts, the rear portionbeing mounted on the bushing 76 so as to be held against movement, whilethe front portion 74 is adapted for movement back and forth in the lineof feed;

The mechanism for actuating the foot lever and for locking the leverwith the presser foot inengagement with the work is similar to thatdisclosed in the patent to French and Meyer ereinbefore referred to andcomprises actuating and locking pawls 82 and 84 engaging respectivelythe actuating lever 85 (see Fig. 4) and the rear portion of the presserfoot lever 80.

An efficient and novel mechanism i provided, however, for unlocking andlifting the presser foot manually, and also for unlocking and liftingthe presser oot automatically upon stopping the machine. The mechanismfor unlocking and lifting the presser foot comprises a lifting lever 88(see Figs. 9 and 10) pivotally mounted upon a portion of the machineframe and having its forward end extending into convenient position tobe manipulated by the operator while its rear end extends over theharp-shaped member 90 pivotally supported upon the rear end of thepresser foot lever 30 and forming a part of the usual thread measuringmechanism. With this arrangement of the lever 88 a downwar movement ofits rear end depresses the rear end of the lever 30 after the pawls 82and 84 7 have been moved out of engagement with their cooperatingratchets and lifts the presser foot from the work. In order to move thepawls 82 and 84 into inoperative position so as to allow the presserfoot to be lifted, a pawl disengaging member 92 is provided mounted toslide in a substantially horizontal direction and provided with arms atits rear end adapted to engage pins on the pawls and move the pawls toan in operative position when a rear movement is imparted to the member92. At its forward end the member 92 is mounted in a slot formed in aweb 94 forming a part of the machine frame. On each side of the web 94the member 92 is provided with projecting flanges 96 whichflanges limitthe movement of the member 92 in each direction as clearly shown inFigs. 5, 6, 7 and'S. For moving the member 92 forwardly and backwardly,an actuating member 98 is provided pivotally mounted upon the bushing'76. An

actuating connection between the member 98 and the member 92 is formedby a segmental portion of the member 98 which extends through the slotin the web 94 at one side of the member 92. A ball is seated in aperforation in the member 92 which call cooperates with a recess 102formed in the member 93 and with a recess 106 formed in one wall of theweb 94. The member 98 is actuated from the lifting lever 88 through apin 108 projecting from the member 98 through a slot in a flangeprojecting from the hub of the lifting lover. The construction andarrangement of the connections between the lifting lever and the pawlreleasing-member 92 are such that during the first portion of thedownward movement of the rear end of the lever 88, the member 93 ismoved from the position indicated in Figs. 5 and 6 to a position inwhich the ball 100 is in engagement with the recess 106 in the web 94.The member 92 is thus moved to release the pawls 82 and 84 from theirratchets before the rear end of the lever 88 comes in contact with theharp-shaped member 90. As the ball 100 enters the recess 106, furthermovement of the member 82 is prevented by the engagement of a flange 96with the web 94 and a continued movement of the member 98 is permittedduring the continued movement of the lifting lever 88 in lifting thepresser foot from the work. The final position of the parts when thepresser foot has been lifted from the work is indicated in Figs. 7 and8. The return movement of the lifting lever 88 to permit the presserfoot to again engage the work first moves the member 98 from theposition indicated in Figs. and 8 while the member 92 remains stationaryand finally after the recess 102 in the member 93 comes opposite therecess 106, the ball 100 enters recess 102 and the forward end of themember 98 engages a flange 112 on the forward end of the member 32 andreturns the member 92 to its original position indicated in Figs. 5 and6. To unlock and lift the presser foot automatically upon stopping themachine, a vertically arranged rod 114 is pro vided as indicated in Fig.10, which extends through a perforation in the rear end of the lever 88.This rod is depressed upon stopping the machine through connections fromthe stopping mechanism hereinafter described and when so depressedactuates the lifting lever 88 to unlock and lift the presser foot by theengagement of a collar 116 secured to the lower end of the rod above therear end of the lever 88.

The driving and stopping mechanism of the machine comprises a forwardlydriving friction clutch which normally drives the machine at a highspeed during the sewing operation, a reversely driving friction clutchwhich is thrown into operation in stopping the machine which retards,stops and reversely rotates the cam shaft at a low speed to finalstopping position, and a timing cam for throwing the reversely drivingfriction clutch into and out of operation.

The high speed forwardly driving friction clutch comprises a clutchsurface formed on the driving pulley 118 and a cooperating frictionsurface on the hand wheel 120. The hand wheel is rigidly secured to asleeve 122 keyed to the cam shaft 124 of the machine, and the pulley 118is mounted to rotate loosely and slide on the sleeve 122. The drivingpulley 118 is moved into and out of engagement with the hand wheel by aclutch shifting lever 126 one end of which engages the hub of the,pulley 118 and the other end of which extends between collars 128secured to the rod 130 connected to the starting and stopping treadle.

The reversely driving clutch which is thrown into operation in stoppingthe machine comprises a driven clutch member 132 integral with a sleeve134 mounted on the sleeve 122 and a driving clutch member 136 mounted torotate loosely on the sleeve 122, and driven continuously at acomparatively low speed by a continuously rotating worm shaft 138engaging a worm wheel formed on the clutch member. The worm 138 isdriven by a belt passing over a pulley 140 secured to the rear end ofthe shaft carrying the worm 138. The driven clutch member 132 of thereverse driving clutch is connected to the hand wheel 120 so as torotate at all times with the hand wheel and with the cam shaft 124 butis mounted to slide longitudinally on the sleeve 122 and is normallyheld out of engagement with the driving clutch member 136 by springs 142acting on plungers secured to a flange 144 rigid with the member 132 andoperating with hollow studs 146 secured to the hand wheel 120 andprojecting into perforations formed in the flange 144. While the members118 and 120 are in engagement and the cam shaft is being driven in aforward direction, the clutch members 132 and 136 are out of engagementand rotating in opposite directions.

The timing cam for moving the clutch member 132 into and out ofengagement with the reversely rotating clutch member 136 is indicated at148 and is mounted on the clutch member 132 so as to move longitudinallytherewith and except as hereinafter described to rotate with said clutchmember. The groove of the timing cam is engaged by one end of ahorizontally arranged bell crank 150 which, while the cam shaft is beingdriven by the forwardly driving clutch, is vibrated idly so that the camhas no effect on the clutch member 132 of the reverse driving clutch andthe members of the reverse driving clutch remain out of engagement. Theother end of the bell crank 150 extends over a vertical movable pin orbolt 152 and is provided with a perforation into which the pin 152 canrise when allowed to do so. This occurs after the forward driving clutchis thrown out of operation by the upward movement of the treadle rod130. The bell crank 159 is thus held against movement during thecontinued rotation of the cam shaft 124 under its momentum, the cam 148together with the member 132 of the reverse driving clutch is forced tothe left into the position illustrated in Fig. 15, and thereby thereverse driving clutch is thrown into operation. The reversing clutchacts first as a friction brake to retard and stop the forward rotationof the cam shaft 124 and then drives the cam shaft backwardly until theclutch members are thrown out by the action of the timing cam 148.

' As has been stated, the stitch forming devices of the machine aretimed so that the awl enters the work after the needle withdraws fromthe work with its loop of thread and before the needle loop is drawnfrom the shuttle, and withdraws from the work before the stitch is setby'the takeup. may be stopped after the loop of needle thread has beendrawn from the shuttle, the timing cam and reverse driving clutch are soconstructed that the reversal in the direction of rotation of the camshaft takes place at this point in In order that the machine I the cycleof operations and in order that the cam shaft may be finally stopped inthe position in which the awl will at once enter thework when themachine is again thrown into operation, the reverse rotation of the camshaft is continued until the awl during such reverse rotation hasentered and again withdrawn from the work. To permit this backwardrotation of the cam shaft and cause the timing cam to disconnect themembers of the reverse clutch at the proper point in the rotation of theshaft, the timing cam 148 is mounted on the driven'memher 132 of thereverse driving clutch through a lost motion connection which permits acertain amount of angular movement of the clutch member with relation tothe cam. This lost motion connection comprises a radially arranged key154 (see Figs. 16 and 1'7) secured in the cam and projecting into asegmental recess 156 in the sleeve portion of the clutch member 132 uponwhich the cam is mounted to have a rotary movement limited by the endsof the segmental recess.

As the driven member 132 of the reverse driving clutch starts to rotatein a reverse direction, the timing cam tends to rotate with the clutchmember. Accordingly, a latch 158 is provided pivotally mounted in theframe of the machine and arranged to engage the outer end of the key 154and hold the timing cam against rota" tion during the first portion ofthe reverse rotation of the clutch member. The latch 158 is providedwith a pin 160 which bears against a cam 162 formed on the clutch member132 and this cam operates to lift the latch 153 out of engagement withthe key 154 before the key is engaged by the rear end of the recess 156.After the reverse driving clutch is thrown out, the cam shaft ispositively stopped in its final position by a stop dog 16% (see Fig. 13)which engages a stop shoulder formed on one of the cam discs 166 of "themachine.

The locking pin or look bolt 152 is mounted in a horizontally arrangedspring pressed car- .rier 15S and is controlled from the treadle rod 139through connections which comprise an arm 170 (see FigsJ12 and 14)pivotally mounted on the machine frame and connected to the upper end ofthe treadle'rod. At its outer end the arm 179 is provided with a camsurface arranged when the treadle rod is depressed to engage a roll 172on a lever arm 174 and swing said lever arm downwardly. A lever arm 176is formed integrally with the arm 174 and is connected by a link 1'78 tothe lower end of the lock bolt 152. The lock bolt is acted upon by aspring 180 which raises the bolt into engagement with the bell crank 150when the treadle ro .130 is allowed to rise and the bolt is lowered outof engagement with the bell crank through the connections described whenthe rod is depressed.

The latch 158 forced into the path of the key 154 by a spring 182connected with a rearward extension from the latch. In order to hold thelatch out of the path of movement of the key 154 during the normalforward rotation of the cam shaft and out of engagement with the cam162, the latch is secured to a rock shaft 184 to which is also securedan arm 1863 which extends into a position to he engaged by a roll 188 onthe arm 1'74.

In throwing the reverse driv'ng clutch into operation a slight movementto the right as viewed in Fig. 12 is imparted to the lock bolt carrier168 from the timing cam 148. In the machine illustrated, this movementof the lock bolt carrier is utilized to lift the presser foot, releasethe tension and open the thread clamp. To this end, a rock shaft 190 ismounted in the carrier 168 and is provided at one end with a springpressed pawl 192 arranged to be engaged by a detent 194 on the arm 17cwhen the arm is in its uppermost position. To the other end of the rockshaft 190 an arm 196 is secured which arm is swung upwardly by therocking of the shaft 190 when the pawl 192 engages the detent 194 duringthe movement of the lock bolt carrier 168 as the reverse clutch isthrown into operation. The arm 196 at its outer end is pivotallyconnected to the lower end a link 198-, the upper end of which isconnected to a lever arm 200 projecting from a rock shaft 202 mounted inthe upper portion of the machine frame. An arm 204 projecting from therock shaft 202 is connected to the upper end of the rod 114 and thearrangement of the lever arms 204 and 200 is such that the arm 196 movesupwardly, the rod 114 is depressed, thereby unlocking and raising thepresser foot as hereinbefore de- If.

scribed.

To the arm 196 is also pivotally connected a link 206, the lower end ofwhich is connected to an 208 projecting from a rock shaft 210. To thisrock shaft is secured an arm 212 (see Figs. 1 3) the forward end ofwhich has a slotted connection with the center joint of toggle links214. which links are normally in line and form the connection betweenthe thread clamp cam 218 on the rock shaft 220 through which the thr adclamp is actuated as in the machine of the French and Meyer patent. Withthis construction, upon stopping the machine, the shaft 210 is rocked tomove the arm 212 downwardly thereby breaking the toggle joint formed bythe links 214 thread clamp.

Simultaneously with the lifting of the presser foot and the opening ofthe thread clamp upon stopping the machine, the tension on the needlethread is released through connections from the and opening the rockshaft 220. To release the tension, the up per end of a rod 222 isconnected to an arm 224 on the rock shaft 220 and the lower end of thisred is connected to the horizontal arm of a bell crank 226. The bellcrank 226 is pivotally mounted in a block 228 through which thestationary stud 230 on which the tension wheel 56 is mounted passes. Theupper end of the vertical arm of the bell crank 226 engages a slot inthe stud 239 so that this end of the bell crank is held stationary andas the rod 222 is raised by the rocking of the shaft 223 in stopping themachine, the bell crank is moved bodily and the block 228 is moved outof frictional engagement with the tension wheel 56 against which it isnormally pressed by the tension spring 232.

The stop dog 16% (see Figs. 12 and 13) is secured to a pivot shaft 234and is forced tovards the cam disc 166 by a spring 236 one end of wl ichis connected to the link 206 and the other end of which is connected toan arm 238 secured to the rock shaft 234. The outer end of the arm 238es-igages beneath a shoulder 240 on the link 206 and by reason of thisconstruction the stop dog 154 is held out of engagement with the cam isc166 while the machine is in operation and permitted to move intoengagement with the disc as the link 2G6 rises during the operation ofthe stopping mechanism.

The nature and scope of the invention having been indicated. and aspecific embodiment of the several features of the invention having beendescribed, what is claimed is:

l. A 'lockstitch sewing machine having, in combination, stitch formingdevices including a hook needle, awl, a shuttle and stitch settingtakeup, mea s for causing the awl to enter the work after the needlewith awe with its loop of thread from the work and before the stitch isset, and mechanism acting when thrown into operation to bring themachine to rest with last stitch completed, and at a point at which theawl in a forward cycle is about to enter the work.

2. A lockstitch sewing mac bination, stitch forming hook needle, an awl,a s means for causing the awl to enter the work after the needle withdiwith is loop of thread from the work and before the needle loop is drawnfrom the shu le, and mechanism acting when thrown into operation tobring the machine to rest after the needle loop been drawn from theshuttle, with the needle free of the thread, and at a point in the cycleof operations of the machine at which the awl, in a forwardcycle, isabout to enter the work.

3. A lockstitch sewing machine having, in combination, stitch formingdevices including a hook needle, awl, a shuttle and a takeup, means forcausing the awl to enter the work after the needle withdraws with itsloop of thread from the work and before the needle loop drawn from theshuttle, a cam shaft and suitable connections for actuating the movingparts of the machine, and mechanism e 3 when thrown into operation toreverse the direction of rotation of the shaft after the having, incomincluding a tie takeup,

.needle loop has been drawn from the shuttle by the takeup and tofinally stop the shaft after the awl, during the reverse movement,enters and withdraws from the work.

l. A lockstitch sewing machine having, in combination, stitch formingdevices including a hook needle, an awl, a shuttle and a takeup, meansfor causing the awl to enter the work after the needle withdraws withits loop of thread from the work and before the needle loop is drawnfrom the shuttle, a cam shaft and suitable connections for actuating themoving parts of the machine, and driving and stopping mechanism for saidshaft including a clutch arranged when thrown into operation to reversethe rotation of the shaft and a timing cam driven by the shaft forthrowing the reversing clutch into and out of operation, said cam havinga lost motion connection with said shaft to allow a limited. reverserotation of the a shaft independently of the cam.

5. A lockstitch sewing machine having, in combination, stitch formingdevices including a hook needle, an awl, a shuttle and a takeup, meansfor causing the awl to enter the work after the needle withdraws withits loop of thread from the work and before the needle loop is drawnfrom the shuttle, a cam shaft and suitable connections for actuating themoving parts of the machine, driving and stopping mechanism for saidshaft including a friction clutch arranged when thrown into operation toretard, stop and reverse the cam shaft, a timing cam driven by the shaftfor throwing the reversing clutch into and out of operation, said camhaving a lost motion connection with said shaft to allow a limitedreverse rotation of the shaft independently of the cam.

6. A lockstitch sewing machine having, in combination, stitch formingdevices including a hook needle, an awl, a shuttle and a takeup, meansfor causing the awl to enter the work after the needle withdraws withits loop of thread from the work and before the needle loop is drawnfrom the shuttle, a cam shaft and suitable connections for actuating themoving parts of the machine, and driving and stopping mechanism for saidcam shaft including a clutch arranged when thrown into operation toreverse the rotation of the cam shaft, a timing cam'for throwing thereversing clutch into and out of operation mounted on the cam shaft tohave a limited angular movement with relation thereto, a latch toprevent rotation in the reverse direction of the timing cam with theshaft, and a cam driven from the camshaft for actuating said latch torelease the timing cam.

7. A lockstitch sewing machine having, in combination, stitch formingdevices including a hook needle, an awl, a shuttle and a takeup, meansfor causing the awl to enter the work after the needle withdraws withits loop of thread from the work and before the needle loop is drawnfrom the shuttle, a cam shaft and suitable connections for actuating themoving parts of the machine, and driving and stopping mechanism for thecamshaft including a clutch arranged when thrown into operation toreverse the rotation of the cam shaft, a timing cam driven by the shaftfor throwing the reversing clutch into and out of operation arranged tocause the cam shaft to be reversed after the needle loop has been drawnfrom the shuttle by the takeup, said cam having a lost motion connectionwith said shaft to allow a limited reverse rotation of the shaftindependently of the cam, and cause the cam shaft to come to rest afterthe awl, during the reverse rotation of the cam shaft, has entered andwithdrawn from the work. 1

8. A sewing machine having, in combination, stitch forming devicesincluding a curved hook needle, a looper, a thread arm, and a shuttle, aneedle guide, a needle segment in which the needle is mounted, afriction shoe carried by the needle guide and engaging the needlesegment to drive the needle guide from the segment, and means foractuating the thread arm to move the needle guide to cover the emptyhook of the needle after the loop of needle thread has been taken fromthe hook.

9. A sewing machine having, in combination, stitch forming devicesincluding a curved hook needle, a needle segment in which the needle ismounted provided with a friction surface concentric withthe segmentaxis, and a needle guide mounted concentric with the segment axis andhaving a radial arm provided with a friction shoe engaging the frictionsurfaceof the segment.

10. A sewing machine having, in combination, stitch forming devicesincluding a curved hook needle and a shuttle, a needle carrier in whichthe needle is mounted, a needle guide, means for frictionally drivingthe needle guide from the needle carrier, and means for moving theneedle guide to cover the empty hook of the needle after the loop ofneedle thread has been taken from the hook.

11. A sewing machine having, in combination,

stitch forming devices including a curved hook needle, a looper, athread arm, and a shuttle, a needle guide, means for frictionallydriving the needle guide, and means for actuating the thread arm to movethe needle guide to cover the empty hook of the needle after the loop ofneedle thread has been taken from the hook.

12. A lockstitch sewing machine having, in

combination, a needle, an awl, a shuttle, a work support, a presserfoot, a thread tension and an intermittently acting thread clamp, a camshaft and suitable connections for actuating the moving parts of themachine, driving and stopping mechanism for the cam shaft including atiming cam driven by the shaft for throwing the stopping mechanism intooperation, and means actu ated from the timing cam in stopping themachine for raising the presser foot, releasing the tension and openingthe thread clamp.

13.,A lociistitch sewing machine having, in combination, a needle, anawl, a shuttle, a Work support, a presser foot, a thread tension andintermittently acting thread clamp, a cam shaft and suitable connectionsfor actuating the moving parts of the machine, driving and stoppingmechanism for the cam shaft including a timing cam driven by the shaftfor throwing the stopping mechanism into operation, and means actuatedfrom the timing cam in stopping the machine for releasing the tensionand opening the thread clamp.

14. A lockstitch sewing machine having, in combination, a needle, anawl, a shuttle, a work support, a presser foot and a thread tension, acam shaft and suitable connections for actuating the moving parts of themachine, driving and stopping mechanism for the cam shaft including atiming cam driven by the shaft for throwing the stopping mechanism intooperation, and means actuated from the timing cam in stopping themachine for releasing the tension.

15. A lockstitch sewing machine having, in combination, a needle, anawl, a shuttle, a work support, a presser foot and an intermittentlyacting thread clamp, a cam shaft and suitable connections for actuatingthe moving parts or" the machine, driving and stopping mechanism for thecam shaft including a timing cam driven by the shaft for throwing thestopping mechanism into operation, and means actuated from the timingcam in stopping the machine for opening the thread clamp.

16. A lockstitch sewing machine having, in combination, a needle, anawl, a shuttle, a work support, a presser foot, a thread tension, and anintermittently acting thread clamp, a cam shaft and suitable connectionsfor actuating the moving parts of the machine, driving and stoppingmechanism for the cam shaft including a timing cam driven by the shaftfor throwing the stopping mechanism into operation, means for renderingthe timing cam operative includ ing a carrier and a lock bolt mountedthereon for operatively connecting the carrier and cam, a rock shaftmounted in the lock bolt carrier, mechanism for rocking the rock shaftfrom the movement of the carrier by the timing cam, and connections fromthe rock shaft for raising the presser foot, releasing the tension andopening the thread clamp.

17. A lockstitch sewing machine having, in combination, a needle, anawl, a shuttle, a work support, a presser foot, a thread tension, and anintermittently acting thread clamp, a cam shaft and suitable connectionsfor actuating the movingparts of the machine, driving and stoppingmechanism for the cam shaft including a timing cam driven by the shaftfor throwing the stopping mechanism into operation, means for renderingthe timing cam operative including a carrier and a loci; bolt mountedthereon for operatively connecting the carrier and earn, a rock shaftmounted in the loci: bolt carrier, mechanism for rocking the rock shaftfrom the movement of the carrier by the timing cam, and connections fromthe reel: shaft for releasing the tension and opening the thread clamp.

18.A lockstitch sewing machine having, in combination, a needle, an awl,a shuttle, a Work support, a presser foot, anda thread tension, a camshaft and suitable connections for actuating the moving parts of themachine, driving and stopping mechanism for the cam shaft including atiming cam driven by the shaft for throwing the stopping mechanism intooperation, means for rendering the timing cam operative including acarrier and a lock bolt mounted thereon for operatively connecting thecarrier and cam, a rock shaft mounted in the lock bolt carrier,mechanism for rocking the rock shaft from the movement of the carrier bythe timing cam, and connections from the rock shaft for releasing thetension.

19. A loekstitch sewing machine having, in combination, a needle, anawl, a shuttle, a work support, a presser foot, and an intermittentlyacting thread clamp, a cam shaft and suitable connections for actuatingthe moving parts of the machine, driving and stopping mechanism,

for the cam shaft including a timing cam driven by the shaft forthrowing the stopping mechanism into operation, means for rendering thetiming cam operative including a carrier and a lock bolt mounted thereonfor operatively connecting the carrier and cam, a rock shaft mounted inthe lock bolt carrier, mechanism for rock- 1' ing the rock shaft fromthe movement of the carrier by the timing cam, and connections from therock shaft for opening the thread clamp.

LAURENCE E. TOPHAM.

